Tax Diary: July to August 2023 Deadlines That May Still Matter

This tax diary highlights key tax deadlines that fell between July and August 2023. It is relevant for taxpayers reviewing whether any filing or payment obligations from this period were missed.

July is a significant month for Self Assessment. Even though these dates have passed, unresolved issues can still result in penalties, interest, or HMRC follow-up action.

Key Tax and Payroll Deadlines for July and August 2023

• 1 July 2023 – Due date for corporation tax due for the year ended 30 September 2022.
• 6 July 2023 – Complete and submit forms P11D return of benefits and expenses and P11D(b) return of Class 1A NICs.
• 19 July 2023 – Pay Class 1A NICs (by the 22 July 2023 if paid electronically).
• 19 July 2023 – PAYE and NIC deductions due for month ended 5 July 2023. (If you pay your tax electronically the due date is 22 July 2023).
• 19 July 2023 – Filing deadline for the CIS300 monthly return for the month ended 5 July 2023.
• 19 July 2023 – CIS tax deducted for the month ended 5 July 2023 is payable by today.
• 1 August 2023 – Due date for corporation tax due for the year ended 31 October 2022.
• 19 August 2023 – PAYE and NIC deductions due for month ended 5 August 2023. (If you pay your tax electronically the due date is 22 August 2023)
• 19 August 2023 – Filing deadline for the CIS300 monthly return for the month ended 5 August 2023.
• 19 August 2023 – CIS tax deducted for the month ended 5 August 2023 is payable by today.

Why July–August Deadlines Are Still Relevant

Tax obligations do not disappear once a deadline has passed. Where a return was not filed or a payment was not made on time, the liability remains until it is resolved.

The 31 July Self Assessment payment date is particularly important, as interest and penalties may apply if amounts remained unpaid after that point, an issue frequently identified during reviews carried out by a tax specialist in London.

Common Obligations Around July and August

Deadlines during this period often relate to:

• Self Assessment payments on account due by 31 July
• Balancing payments where applicable
• VAT return submissions and payments
• PAYE and National Insurance reporting and payments

Which obligations applied will depend on your circumstances, such as whether you were self-employed, a landlord, an employer, or otherwise within Self Assessment.

What Happens If a Deadline Was Missed?

If a tax deadline in July or August 2023 was missed, HMRC may have charged interest from the original due date. Penalties can also apply in some cases.

The longer an issue remains unresolved, the greater the potential cost. Even where no immediate penalty notice was issued, HMRC may still pursue the matter later particularly where inconsistencies emerge following engagement with a tax consultant in London.

Why It Is Worth Reviewing Now

Some taxpayers assume that once the July deadline has passed, nothing further can be done. In practice, addressing missed obligations sooner can limit further charges and reduce compliance risk.

Reviewing whether all July–August 2023 obligations were met can help avoid unexpected demands or enforcement action later.

HMRC Guidance on Late Tax Payments

HMRC explains how interest and penalties apply to late tax payments on
GOV.UK.

Did You Miss Any July or August 2023 Deadlines?

Whether any action is required now will depend on which obligations applied to you at the time and whether they were dealt with correctly. For individuals and businesses in Farringdon and nearby areas such as Hatton Garden and Smithfield, CIGMA Accounting can review your position and confirm whether anything remains outstanding or needs to be addressed.